ci(Travis): review configuration

Author: KaiSchwarz-cnic

.travis.yml

@@ -1,8 +1,11 @@
 language: java
 dist: xenial
 notifications:
-  email: false
-sudo: false
+  email:
+    recipients:
+    - kschwarz@hexonet.net
+    on_success: never
+    on_failure: always
 install: true
 jdk:
   - oraclejdk11
@@ -31,4 +34,4 @@ after_success:
       nvm use lts/* &&
       npm prune &&
       npm i &&
-      npx travis-deploy-once "npx semantic-release" ; fi
+      npx travis-deploy-once "npx semantic-release" ; fi